Picture always gets resized to maximum. imshow not working as expected

edit

Ok this is a weired one. I have a picture that I show. The picture is very big but normaly it should be able to scale the window. However as soon as I click on the picture it always goes to its huge scale on my machine. What could be the reason?

I insalled OpencCV 4.2.0 with CUDA on KDE NEON 5.18

The toy code for the display to check the issue:

#include <iostream>
#include <thread>
#include <vector>

#include <opencv2/core.hpp>
#include <opencv2/highgui.hpp>

int main()
{
    std::string _windowName = "Test";
    cv::namedWindow(_windowName, cv::WINDOW_NORMAL);

    cv::Mat background = cv::imread("../data/nyc.jpg");

    while (true)
    {
        std::this_thread::sleep_for(std::chrono::milliseconds(1));
        cv::imshow(_windowName, background);
        if (cv::waitKey(33) == 27)
        {
            cv::destroyAllWindows();
            break;
        }
    }
}

If I run this on my machine it looks like this:

Trying to resize ends up making the picture directly like this:

However on annother machines it poops up scaled and can get resized as expected:

If you want to investigate it. I uploaded the test project on github: You can find it complete in my github here: https://github.com/sandro4912/opencvD...

EDIT: for troubleshooting I also tryed out a python version which does the same:

import cv2
img = cv2.imread("path")
cv2.namedWindow("Window", cv2.WINDOW_NORMAL)
cv2.imshow("Window", img)
if (cv2.waitKey(0) & 0xff) == 27:
  cv2.destroyAllWindows()

Still same result as in the C++ version.

I also uninstalled the library and tryed it with OpenCV4.1 and still same result.

What else could I check?